Hi, I had my goldfish and a black moor in an 100L cycled tank (ammonia, nitrates and nitrites are all perfect). Recently the black moor became sick and got white slime patches all over it and was lying on it's side at the bottom of the tank. I moved the black moor to a 15L hospital tank and treated it with melafix and pimafix and did daily water changes. It seemed to be getting better but then the white patches came back again. I've been treating it for three weeks now I used pimafix and melafix for the first two, and then switched to interpet anti slime and velvet but it just stayed the same and is still lying on its side. I don't know what I'm doing wrong, if anyone has any advice that would be great thanks.